refactor: remove legacy node syntax polyfills

package.json

@@ -41,8 +41,6 @@
     "@babel/plugin-syntax-class-properties": "^7.12.13",
     "@babel/plugin-syntax-import-assertions": "^7.24.7",
     "@babel/plugin-transform-export-namespace-from": "^7.24.7",
-    "@babel/plugin-transform-nullish-coalescing-operator": "^7.24.7",
-    "@babel/plugin-transform-optional-chaining": "^7.24.7",
     "@babel/plugin-transform-typescript": "^7.24.7",
     "@babel/preset-typescript": "^7.24.7",
     "@babel/template": "^7.24.7",

src/babel.ts

@@ -41,13 +41,6 @@ export default function transform(opts: TransformOptions): TRANSFORM_RESULT {
     _opts.plugins.push(require("@babel/plugin-syntax-import-assertions"));
   }
 
-  if (opts.legacy) {
-    _opts.plugins.push(
-      require("@babel/plugin-transform-nullish-coalescing-operator"),
-    );
-    _opts.plugins.push(require("@babel/plugin-transform-optional-chaining"));
-  }
-
   if (opts.babel && Array.isArray(opts.babel.plugins)) {
     _opts.plugins?.push(...opts.babel.plugins);
   }

src/eval.ts

@@ -5,7 +5,6 @@ import { dirname, basename, extname } from "pathe";
 import { hasESMSyntax } from "mlly";
 import {
   debug,
-  detectLegacySyntax,
   jitiInteropDefault,
   readNearestPackageJSON,
   wrapModule,
@@ -43,9 +42,7 @@ export function evalModule(
     (isTypescript ||
       isESM ||
       ctx.isTransformRe.test(filename) ||
-      hasESMSyntax(source) ||
-      (ctx.opts.legacy && detectLegacySyntax(source)));
-
+      hasESMSyntax(source));
   const start = performance.now();
   if (needsTranspile) {
     source = transform(ctx, {

src/options.ts

@@ -20,7 +20,6 @@ const jitiDefaults: JITIOptions = {
   sourceMaps: _EnvSourceMaps === undefined ? false : !!_EnvSourceMaps,
   interopDefault: false,
   cacheVersion: "7",
-  legacy: lt(process.version || "0.0.0", "14.0.0"),
   extensions: [".js", ".mjs", ".cjs", ".ts", ".mts", ".cts", ".json"],
   alias: _EnvAlias,
   nativeModules: _EnvNative || [],
@@ -32,9 +31,6 @@ export function resolveJitiOptions(userOptions: JITIOptions): JITIOptions {
   const opts: JITIOptions = { ...jitiDefaults, ...userOptions };
 
   // Cache dependencies
-  if (opts.legacy) {
-    opts.cacheVersion += "-legacy";
-  }
   if (opts.transformOptions) {
     opts.cacheVersion += "-" + objectHash(opts.transformOptions);
   }

src/transform.ts

@@ -5,7 +5,6 @@ import { debug } from "./utils";
 export function transform(ctx: Context, topts: any): string {
   let code = getCache(ctx, topts.filename, topts.source, () => {
     const res = ctx.opts.transform!({
-      legacy: ctx.opts.legacy,
       ...ctx.opts.transformOptions,
       babel: {
         ...(ctx.opts.sourceMaps

src/types.ts

@@ -41,7 +41,6 @@ export type TransformOptions = {
   filename?: string;
   ts?: boolean;
   retainLines?: boolean;
-  legacy?: boolean;
   async?: boolean;
   [key: string]: any;
 };
@@ -60,7 +59,6 @@ export type JITIOptions = {
   v8cache?: boolean;
   interopDefault?: boolean;
   cacheVersion?: string;
-  legacy?: boolean;
   extensions?: string[];
   transformOptions?: Omit<TransformOptions, "source">;
   alias?: Record<string, string>;

src/utils.ts

@@ -29,10 +29,6 @@ export function md5(content: string, len = 8) {
   return createHash("md5").update(content).digest("hex").slice(0, len);
 }
 
-export function detectLegacySyntax(code: string) {
-  return code.match(/\?\.|\?\?/);
-}
-
 export function isObject(val: any) {
   return val !== null && typeof val === "object";
 }